List of species included in the analyses with information on copulatory behaviour and relative testes size

List of species included in the analyses with information on copulatory behaviour and relative testes size. Lock: presence or absence of copulatory lock; IN: intromission number – the number of intromissions preceding the first ejaculation; EN: ejaculation number – the mean number of ejaculations achieved with a single female before attainment of some satiety criterion; III: inter-intromission interval – the mean interval separating the intromissions of the first copulatory series; PEI: post-ejaculatory interval – the interval between the end of the first ejaculation and the beginning of the next intromission; EL: ejaculation latency – the mean latency from the first intromission to the end of the first (or only) ejaculation; RTS: relative testes size - based on the regression equation for the relationship between log body mass and log testes mass for rodents in Kenagy and Trombulak (1986); (s): seconds; species data labelled (1) or (2) are for different populations.